Mar 31, 2026 filings. Quarterly 13F reports arrive up to 45 days after quarter end; this register is filed through May 29, 2026.
145 institutional managers reported holding MUX for the quarter ended Mar 31, 2026. Together they hold about 42% of shares outstanding; the top 10 hold 22%. 42 opened new positions; 23 closed out. Complete ranked register from SEC 13F filings.
| manager | shares | % out | value (Mar 31, 2026 close) | change | held since |
|---|---|---|---|---|---|
| State Street | 3.36M | 4.64% | $68.7M | added +53.5% | ≤2013 |
| Mirae Asset Global Etfs Holdings LTD. | 2.13M | 2.95% | $43.6M | trimmed -3.2% | 2018 Q3 |
| BlackRock | 1.95M | 2.69% | $39.8M | added +6.1% | ≤2013 |
| VAN ECK Associates CORP | 1.57M | 2.17% | $32.1M | trimmed -1.8% | ≤2013 |
| Tidal Investments LLC | 1.36M | 1.88% | $27.8M | trimmed -7.7% | 2024 Q1 |
| Two Sigma | 1.30M | 1.80% | $26.6M | added +80.7% | 2019 Q4 |
| Dimensional Fund Advisors | 1.27M | 1.75% | $25.9M | added +15.7% | ≤2013 |
| UBS | 1.12M | 1.55% | $22.9M | trimmed -21.9% | ≤2013 |
| BNP Paribas Financial Markets | 1.09M | 1.50% | $22.3M | added +8.7% | 2024 Q3 |
| Vanguard Group | 1.03M | 1.42% | $20.9M | added +10.5% | ≤2013 |
| Morgan Stanley | 847.1k | 1.17% | $17.3M | trimmed -13.4% | ≤2013 |
| FMR (Fidelity) | 757.0k | 1.04% | $15.5M | added +28.3% | 2021 Q1 |
| Mawer Investment Management LTD. | 706.9k | 0.98% | $14.4M | added +182.8% | 2025 Q4 |
| Bank OF Montreal /CAN/ | 686.5k | 0.95% | $14.0M | added +895.1% | ≤2013 |
| Amundi | 675.1k | 0.93% | $13.8M | trimmed -12.2% | 2025 Q4 |
| Synergy Asset Management, LLC | 610.1k | 0.84% | $12.5M | trimmed -16.6% | 2025 Q4 |
| Geode Capital | 603.0k | 0.83% | $12.3M | added +15.4% | ≤2013 |
| Voloridge Investment Management | 591.7k | 0.82% | $12.1M | trimmed -15.6% | 2025 Q3 |
| Royal Bank OF Canada | 535.1k | 0.74% | $10.9M | trimmed -6.8% | ≤2013 |
| Bank OF America CORP /DE/ | 534.8k | 0.74% | $10.9M | added +1347.7% | ≤2013 |
| Marshall Wace | 471.2k | 0.65% | $9.6M | added +497.8% | 2025 Q4 |
| Bridgeway Capital Management, LLC | 445.4k | 0.61% | $9.1M | added +3.7% | 2024 Q4 |
| Alps Advisors INC | 425.5k | 0.59% | $8.7M | opened | 2016 Q3 |
| Nomura Asset Management International INC. | 408.9k | 0.56% | $8.4M | trimmed -16.1% | 2025 Q1 |
| Barclays PLC | 323.6k | 0.45% | $6.6M | added +124% | 2025 Q1 |
| Wells Fargo & COMPANY/MN | 323.4k | 0.45% | $6.6M | added +7778.3% | ≤2013 |
| Charles Schwab Investment Management | 294.8k | 0.41% | $6.0M | added +8.5% | ≤2013 |
| Alberta Investment Management CORP | 286.0k | 0.40% | $5.8M | opened | 2026 Q1 |
| PDT Partners | 282.8k | 0.39% | $5.8M | trimmed -1.8% | 2022 Q4 |
| Empowered Funds, LLC | 275.4k | 0.38% | $5.6M | added +6.1% | 2024 Q4 |
| Citadel Advisors | 234.5k | 0.32% | $4.8M | added +73.9% | ≤2013 |
| HRT Financial LP | 206.7k | 0.28% | $4.2M | added +92.3% | 2025 Q2 |
| D. E. Shaw | 197.8k | 0.27% | $4.0M | trimmed -45.7% | 2024 Q1 |
| Northern Trust | 166.1k | 0.23% | $3.4M | added +7.4% | ≤2013 |
| LPL Financial LLC | 150.9k | 0.21% | $3.1M | trimmed -20.4% | 2023 Q2 |
| Graham Capital Management, L.p. | 139.2k | 0.19% | $2.8M | opened | 2026 Q1 |
| American Century Companies INC | 127.3k | 0.18% | $2.6M | added +0.7% | 2023 Q2 |
| Goldman Sachs | 126.7k | 0.17% | $2.6M | trimmed -9.7% | ≤2013 |
| Trexquant Investment LP | 115.5k | 0.16% | $2.4M | opened | 2026 Q1 |
| Condire Management, LP (focused) | 113.0k | 0.16% | $2.3M | unchanged | 2024 Q3 |
| Occudo Quantitative Strategies LP | 112.8k | 0.16% | $2.3M | added +67% | 2025 Q1 |
| Schonfeld Strategic Advisors | 111.9k | 0.15% | $2.3M | added +389% | 2025 Q2 |
| Connor, Clark & Lunn Investment Management LTD. | 110.3k | 0.15% | $2.3M | opened | 2026 Q1 |
| U S Global Investors INC | 100.0k | 0.14% | $2.0M | unchanged | 2025 Q4 |
| Swiss National Bank | 97.9k | 0.14% | $2.0M | added +6.3% | 2025 Q4 |
| Winmill & CO. INC | 97.5k | 0.14% | $2.0M | added +105.3% | 2025 Q4 |
| Group ONE Trading LLC | 82.8k | 0.11% | $1.7M | opened | 2024 Q2 |
| Citigroup INC | 74.9k | 0.10% | $1.5M | added +1477.2% | 2024 Q3 |
| North Star Investment Management CORP. | 68.0k | 0.09% | $1.4M | added +6081.8% | 2016 Q4 |
| Jane Street | 63.6k | 0.09% | $1.3M | trimmed -66.1% | 2014 Q1 |
Largest 50 of 145 shown; the full ranked, searchable register is at boothcheck.com/holders/MUX. Related filers are grouped using the filings' own included-manager declarations. Historically, several managers opening new positions in the same quarter said almost nothing about the quarter that followed (59,118 cases since 2013). A filed record, not a forecast. Nothing here is investment advice.